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Loans - Details of Negotiable Obligations (Parenthetical) (Detail) - Medium Term Notes [member] $ in Millions	Dec. 31, 2017 USD ($)
Two Thousand Eight [Member]
Disclosure of detailed information about borrowings [line items]
Negotiable amount	$ 10,000
Nineteen Ninety Seven [Member]
Disclosure of detailed information about borrowings [line items]
Negotiable amount	$ 1,000

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

Negotiable amount.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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X

- Details

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X

- Details

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